package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单，是否被别的地方引用

        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查询出所有的分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2.组装成父子的属性结构
        //2.1找到所有一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0
        ).map((menu)->{
            //2.2找到所有一级分类的子分类
            //meun 当前菜单的子菜单   entities所有菜单数据
            menu.setChildren(getChildrens(menu,entities));

            return menu;
        }).sorted((menu1,menu2)->{
            //将查询出的数据进行排序
            return ((menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort()));
        }).collect(Collectors.toList());

        return level1Menus;
    }

    /**
     * 写一个递归获取所有的子菜单数据
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1.找子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2.菜单的排序
            return ((menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort()));
        }).collect(Collectors.toList());

        return  children;
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }


}